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Molybdenum disulfide - molybdenum oxide lubricants

Datetime:2016/7/5 21:01:36hit:10500

 

Molybdenum disulfide - molybdenum oxide lubricants. A solid lubricating material consisting essentially of an intimate mixture of about 15 to 50 mole percent molybdenum trioxide, balance molybdenum disulfide. This material is particularly useful under extreme environmental conditions such as very high temperature or vacuum. The material may be used in powder form, compacted into a pellet or other desired shape, incorporated into a grease composition or incorporated into a resin-bonded solid film lubricant.


EXAMPLE
High purity MoO3 and Sb2 O3 were individually ground mechanically then sieved through a 30 micron nickel screen. The oxides were weighed and thoroughly mixed with technical grade MoS2.


Wear compacts were prepared using a laboratory press with a 6.35 mm (diameter) cylindrical die under 172 MPa (25 ksi) load. One half of the die served as a compact holder which was mounted in a lathe so that a conical tip could be formed with a receding 21.8¡ã angle to facilitate microscopic examination of cone diameter for calculating wear volume.
Single pellets were mounted in a Midwest Research Institute Mark VB test machine (Midwest Research Institute, Kansas City, Missouri) for wear evaluation. This machine is a pin-on-disk test machine which permits mounting of a wear compact on a counterbalanced arm. The arm may be loaded with weights directly over the compact. The arm is mounted by two leaf springs that resist the friction force. A portion of the arm is the core of a linear variable differential transformer (LVDT). Outputs of the LVTD varies as frictional forces change. The test area of the apparatus is mounted underneath a bell jar for countrol of temperature and pressure.


The flat wear substrate was type 302 stainless steel shim stock (0.05 mm thick) rigidly attached to a massive heated support. The counter-balanced arm was loaded with 100 g. The system was purged with dry air and the wear surface was heated to 315¡ã¡À5¡ã C. Under test, the support rotated at 500¡À10 rpm; each compact described a circular wear track of 23.81 mm. diameter on the substrate. Each compact was worn for 1000 seconds. The equivalent sliding distance was 180.5 m.
The following table presents wear volume and coefficient of friction data for compacts of MoS2 (above), 75 mole % MoS2 +25 mole % MoO3and 75 mole % MoS2 +25 mole % Sb2 O3. The wear volume represents the volume of compact worn away over the test period.